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LM4040, LM4040A, LM4040B, LM4040C, LM4040D

Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

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Active: In Production.


The LM4040 is a precision two-terminal shunt mode, bandgap voltage reference available in fixed reverse breakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical applications, the LM4040 is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount packages (SOT23 versions are also available).

Laser-trimmed resistors ensure precise initial accuracy. With a 100ppm/°C temperature coefficient, the device is offered in four grades of initial accuracy ranging from 0.1% to 1%. The LM4040 has a 60µA to 15mA shunt current capability with low dynamic impedance, ensuring stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents.

The LM4040 does not require an external stabilizing capacitor while ensuring stability with any capacitive load.

The LM4040 is guaranteed over the temperature range of -40°C to +125°C.

For a 1.225V output version, refer to the LM4041 data sheet.

Data Sheet

Download this datasheet in PDF formatDownload Rev 8 (PDF, 452.3kB)
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Key Features

  • Ultra-Small 3-Pin SC70 Package
  • 0.1% (max) Initial Accuracy
  • 100ppm/°C (max) Temperature Coefficient Guaranteed over -40°C to +125°C Temperature Range
  • Wide Operating Current Range: 60µA to 15mA
  • Low 28µVRMS Output Noise (10Hz to 10kHz)
  • 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V Fixed Reverse Breakdown Voltages
  • No Output Capacitors Required
  • Tolerates Capacitive Loads


  • Cell Phones
  • Industrial Process Controls
  • Notebook Computers
  • Portable Battery-Powered Equipment

Key Specifications:

Voltage References
Part Number VOUT
Temp. Coeff.
Initial Accuracy
(% max)
Oper. Temp.
max @ +25°C min max See Notes
100 0.1 65 15
-40 to +85
-40 to +125
$0.95 @1k
LM4040B  100 0.2 65 $0.43 @1k
LM4040C  100 0.5 65 $0.37 @1k
LM4040D  150 1 70 $0.32 @1k
See All Voltage References (174)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


LM4040: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding LM4040
New Product Press Release   2000-05-12 ]

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Document Ref.: 19-1787 Rev 8; 2013-03-07
This page last modified: 2013-03-07